Inventor

KOYANAGI HAJIME

JP19 patents

⚠️ This page may combine multiple inventors who share the name “KOYANAGI HAJIME”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

KOYANAGI HAJIME

HITACHI LTD

Surface observing apparatus and method

Recording medium and recording device

Tracking method and recording means thereby

Precision machining method precision machining apparatus and data storage apparatus using the same

Precision machining method, precision machining apparatus and data storage apparatus using the same

Scanning probe microscope and method of control error correction

Device using sensor for small rotation angle

PIONEER ELECTRONIC CORP

Optical pickup

Optical pickup device with three beam tracking servo control using oval beams

Optical disk information recording apparatus and reproducing apparatus having a plurality of read or write beams

Optical pickup and optical disk drive for use with a high-density optical disk

Optical pickup apparatus with a crosstalk balance detecting circuit

Optical disk information recording apparatus and reproducing apparatus having a plurality of read or write beams

Optical pickup device for eliminating unwanted data

HITACHI HIGH TECH CORP

Scanning electron microscope and calibration of image distortion

Standard reference component for calibration, fabrication method for the same, and scanning electron microscope using the same

Charged particle beam measurement equipment, size correction and standard sample for correction

PIONEER CORP

Optical pickup device with focus error detecting optical element and method for focus error detection

Detection device, method of detecting distance to object, program, and storage medium